--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-watcher-cross-stop.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,112 @@
+/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "uv.h"
+#include "task.h"
+
+#include <string.h>
+#include <errno.h>
+
+/* NOTE: Number should be big enough to trigger this problem */
+#if defined(__CYGWIN__) || defined(__MSYS__) || defined(__PASE__)
+/* Cygwin crashes or hangs in socket() with too many AF_INET sockets.  */
+/* IBMi PASE timeout with too many AF_INET sockets.  */
+static uv_udp_t sockets[1250];
+#else
+static uv_udp_t sockets[2500];
+#endif
+static uv_udp_send_t reqs[ARRAY_SIZE(sockets)];
+static char slab[1];
+static unsigned int recv_cb_called;
+static unsigned int send_cb_called;
+static unsigned int close_cb_called;
+
+static void alloc_cb(uv_handle_t* handle, size_t size, uv_buf_t* buf) {
+  buf->base = slab;
+  buf->len = sizeof(slab);
+}
+
+
+static void recv_cb(uv_udp_t* handle,
+                    ssize_t nread,
+                    const uv_buf_t* buf,
+                    const struct sockaddr* addr,
+                    unsigned flags) {
+  recv_cb_called++;
+}
+
+
+static void send_cb(uv_udp_send_t* req, int status) {
+  send_cb_called++;
+}
+
+
+static void close_cb(uv_handle_t* handle) {
+  close_cb_called++;
+}
+
+
+TEST_IMPL(watcher_cross_stop) {
+#if defined(__MVS__)
+  RETURN_SKIP("zOS does not allow address or port reuse when using UDP sockets");
+#endif
+  uv_loop_t* loop = uv_default_loop();
+  unsigned int i;
+  struct sockaddr_in addr;
+  uv_buf_t buf;
+  char big_string[1024];
+
+  TEST_FILE_LIMIT(ARRAY_SIZE(sockets) + 32);
+
+  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
+  memset(big_string, 'A', sizeof(big_string));
+  buf = uv_buf_init(big_string, sizeof(big_string));
+
+  for (i = 0; i < ARRAY_SIZE(sockets); i++) {
+    ASSERT_OK(uv_udp_init(loop, &sockets[i]));
+    ASSERT_OK(uv_udp_bind(&sockets[i],
+                          (const struct sockaddr*) &addr,
+                          UV_UDP_REUSEADDR));
+    ASSERT_OK(uv_udp_recv_start(&sockets[i], alloc_cb, recv_cb));
+    ASSERT_OK(uv_udp_send(&reqs[i],
+                          &sockets[i],
+                          &buf,
+                          1,
+                          (const struct sockaddr*) &addr,
+                          send_cb));
+  }
+
+  while (recv_cb_called == 0)
+    uv_run(loop, UV_RUN_ONCE);
+
+  for (i = 0; i < ARRAY_SIZE(sockets); i++)
+    uv_close((uv_handle_t*) &sockets[i], close_cb);
+
+  ASSERT_GT(recv_cb_called, 0);
+
+  uv_run(loop, UV_RUN_DEFAULT);
+
+  ASSERT_EQ(ARRAY_SIZE(sockets), send_cb_called);
+  ASSERT_EQ(ARRAY_SIZE(sockets), close_cb_called);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}